<template>
  <div class="login_container">
    <el-row>
      <el-col :span="12" :xs="0"></el-col>
      <el-col :span="12" :xs="24">
        <el-form class="login_from" :model="loginFrom" :rules="rules" ref="loginForms">
          <h1>Hello</h1>
          <h2>欢迎登录</h2>
          <el-form-item prop="username">
            <el-input :prefix-icon="User" v-model="loginFrom.username"></el-input>
          </el-form-item>
          <el-form-item prop="password">
            <el-input type="password" :prefix-icon="Lock" v-model="loginFrom.password" show-password></el-input>
          </el-form-item>
          <el-form-item>
            <el-button :loading="loading" class="login_btn" type="primary" size="default" @click="login">登录</el-button>
          </el-form-item>
        </el-form>
      </el-col>
    </el-row>
  </div>
</template>

<script setup lang="ts">
import { User, Lock } from '@element-plus/icons-vue';
import { reactive, ref } from 'vue'
import { useRouter, useRoute } from 'vue-router';
import { ElNotification } from 'element-plus'
// 引入获取当前时间的函数
import { getTime } from '@/utils/time'
// 获取路由器
let $router = useRouter()
// 获取路由对象
let $route = useRoute()
// 定义变量控制按钮加载效果
let loading = ref(false)
// 引入用户相关的小仓库
import useUserStore from '@/store/modules/user'
let useStore = useUserStore()

// 获取el-form组件
let loginForms = ref()

let loginFrom = reactive({ username: 'admin', password: 'atguigu123' })
const login = async () => {
  // 保证全部表单项校验通过再发请求
  await loginForms.value.validate()
  
  // 加载效果 开始加载
  loading.value = true
  try {
    await useStore.userLogin(loginFrom)
    let redirect:any = $route.query.redirect
    $router.push({path: redirect || '/'})
    ElNotification({
      type: 'success',
      message: '登录成功',
      title: `HI,${getTime()}好`
    })
    loading.value = false
  } catch (error) {
    // 登录失败加载效果消失
    loading.value = false
    ElNotification({
      type: 'error',
      message: (error as Error).message,
    })
  }
}

// 自定义校验规则函数
const validatorUserName = (_rule: any, value: any, callback: any) => {
  // rule: 即为校验规则对象
  // value: 即为表单元素文本内容
  // 函数：如果符合条件callBack放行通过即可
  // 如果不符合条件callback方法，注入错误提示信息
  if (value.length >= 5) {
    callback()
  } else {
    callback(new Error('账号长度至少5位'))
  }
}
const validatorPassword = (_rule: any, value: any, callback: any) => {
  if (value.length >= 6) {
    callback()
  } else {
    callback(new Error('密码长度至少6位'))
  }
}

// 表单校验配置对象
const rules = {
  username: [
    // {
    //   required: true,
    //   min: 5,
    //   max: 10,
    //   message: '账号长度至少5位',
    //   trigger: 'change',
    // }
    { trigger: 'change', validator: validatorUserName }
  ],
  password: [
    // {
    //   required: true,
    //   min: 6,
    //   message: '密码长度至少6位',
    //   trigger: 'change',
    // }
    { trigger: 'change', validator: validatorPassword }
  ]
}
</script>

<style scoped lang="scss">
.login_container {
  width: 100vw;
  height: 100vh;
  background: url('@/assets/images/background.jpg') no-repeat;
  background-size: cover;

  .login_from {
    position: absolute;
    width: 50%;
    top: 30vh;
    background: url('@/assets/images/login_form.png') no-repeat;
    background-size: cover;
    padding: 40px;

    h1 {
      color: white;
      font-size: 40px;
    }

    h2 {
      font-size: 20px;
      color: white;
      margin: 20px 0;
    }

    .login_btn {
      width: 100%;
    }
  }
}
</style>